Question

我仅在配置文件和发行版（网络）版本中遇到此问题，但在调试版本中一切正常。

因此，我正在使用此类，该类可以访问didChangeDependencies()

中的bloc

class _CategoryPageState extends State<CategoryPage> {
  BizBloc _bizBloc;
  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    _bizBloc = BizBlocProvider.of(context);
  }
}

BlocProvider几乎位于应用程序的根目录附近，在main.dart中定义如下：

Widget build(BuildContext context) {
  return CityBlocProvider(
    child: CategoryBlocProvider(
        child: BizBlocProvider(
            child: MaterialApp( /** actual code goes here */ )
  )));
}

使用此设置，它在调试模式下都能正常工作，但是在配置文件构建中，出现以下错误：

══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
js_primitives.dart:49 The following NullError was thrown building Builder:
js_primitives.dart:49 NoSuchMethodError: method not found: 'get$bloc' on null
js_primitives.dart:49 
js_primitives.dart:49 Widget creation tracking is currently disabled. Enabling it enables improved error messages. It can
js_primitives.dart:49 be enabled by passing `--track-widget-creation` to `flutter run` or `flutter test`.
js_primitives.dart:49 
js_primitives.dart:49 When the exception was thrown, this was the stack:
js_primitives.dart:49 TypeError: Cannot read property 'get$bloc' of undefined
js_primitives.dart:49     at Object.BizBlocProvider_of (https://bazon.in/app/main.dart.js:10277:126)
js_primitives.dart:49     at _CategoryPageState.didChangeDependencies$0 (https://bazon.in/app/main.dart.js:47315:25)
js_primitives.dart:49     at StatefulElement._firstBuild$0 (https://bazon.in/app/main.dart.js:85143:31)
js_primitives.dart:49     at StatefulElement.mount$2 (https://bazon.in/app/main.dart.js:85016:12)
js_primitives.dart:49     at SingleChildRenderObjectElement.inflateWidget$2 (https://bazon.in/app/main.dart.js:84733:16)
js_primitives.dart:49     at SingleChildRenderObjectElement.updateChild$3 (https://bazon.in/app/main.dart.js:84661:20)
js_primitives.dart:49     at SingleChildRenderObjectElement.mount$2 (https://bazon.in/app/main.dart.js:85506:39)
js_primitives.dart:49     at StatelessElement.inflateWidget$2 (https://bazon.in/app/main.dart.js:84733:16)
js_primitives.dart:49     at StatelessElement.updateChild$3 (https://bazon.in/app/main.dart.js:84661:20)
js_primitives.dart:49     at StatelessElement.performRebuild$0 (https://bazon.in/app/main.dart.js:85039:41)

个人资料版本托管在https://bazon.in/app/#/上

这里可能出什么问题了？

Flutter网站：BlocProvider：TypeError：无法读取未定义的属性“ get $ bloc”

0 个答案: